Neurology

I won't recommend you to take oxycodone hydrochloride and Methylphenidate Hydrochloride (ritalin/concerta) together. You should consult with a neurologist first. Both medicines can have stimulant effects on the body and may interact with each other, potentially leading to serious side effects. 

It can be neurological symptoms that could be related to a number of conditions. Pinning, burning, and sensory changes that start in one part of the body and spread to other areas could be a sign of nerve damage or dysfunction. See a neurologist as soon as possible to talk your symptoms more in detail and undergo a thorough physical and neurological examination.

Speak with a neurologist to know the main cause of your headaches, dizziness, and nausea. Some possible causes include migraines, tension headaches, and viral infections.

Teeth grinding and hemifacial spasm can be due to a stress, anxiety, and neurological conditions.  Medications, physical therapy, and lifestyle modifications can help. 
Nerve pain and difficulty swallowing could also be related to a neurological condition and may require further evaluation and treatment. Check thouroughly with a neurologist.

Sounds like you are experiencing symptoms of sleep disorder and depression. Speak to a neurologist regarding your sleep problems, and practice healthy sleeping habit.

Lower back pain can be caused by muscle strain, poor posture or a sprain. See a neurologist or a physical therapist for proper treatment. Avoid activities that aggravate pain, do gentle exercises or stretches.

Migraine headaches causes due to stress or other medical reasons. Get proper diagnosis and treatment from an experienced neurologist.

Taking 3 tablets of Vivax 5mg can lead to an overdose of the medication, which can cause dizziness, confusion, headache, and nausea. But since Vivax 5mg is a relatively low dose medication the risk of serious complications is low. Also taking Naxdom along with it is not harmful. But if you face any serious symtpoms then consult a neurologist.

You can check this article for more information - Stem cell for Spinal Cord Injury. You should also consult a neurologist or neurosurgeon for advice on stem cell therapy for your spinal cord injury. However, stem cell therapy is still an experimental treatment and its effectiveness is not yet fully established. 

Some causes for feeling dizzy in the morning are dehydration, low blood sugar, inner ear problems, anxiety or stress, medication side effects, or a sleep disorder. You can contact a general physician or a neurologist for proper evaluation.

Stem cell treatment for cerebral palsy is an emerging therapy, but its effectiveness and safety have not been established through large clinical trials. I suggest that you consult with a pediatric neurologist or a specialist in stem cell therapy to learn more about the treatment options available for your child's condition. You may refer the links of articles for more information - Cerebral Palsy Treatment in India

Headaches can have a variety of reasons including stress, tension, dehydration, eye strain, or sinus issues. The symptoms you mentioned can sometimes be related with more serious conditions, like migraine, nerve damage, or blood circulation issues, and a healthcare professional can conduct a physical examination, review her medical history, and perform necessary diagnostic tests to help determine the cause of her symptoms.

If you're facing severe headache or migraine for more than a week, along with body pain and fever then consult a neurologist as there can be some reason that the doctor can evaluate.

The symptoms you mentioned could be related to a neurological condition. There are many different conditions that can cause problems with movement and speech, so its important to get a proper diagnosis from a neurologist.

These symptoms can be caused by several reasons like allergies, dehydration, lack of sleep, stress, medication side effects. Even medical conditions, such as thyroid problems, anemia, or diabetes could be the reason. Soo its better to get a medical checkup done to find out and get suitable treatment.