Holding your breath for a long time can sometimes make you dizzy or suffocate, nevertheless, it is improbable for you to suffer from a permanent brain injury. Your brain which requires oxygen is doing well because you have been receiving good oxygen levels. If you're feeling worried, try some relaxation techniques like deep breathing or talking to someone you trust. 

It seems like you are having problems with falling asleep at night. Some common signs of insomnia are difficulty in sleeping, feeling exhausted during the day, and not being interested in things. It can result from stress, a harmful lifestyle, or some other reasons. Try to keep your room dark, stay away from screens before sleeping, and come up with a relaxing bedtime routine that will help you sleep better.

The most common reasons for this are stress, lack of sleep, and eye strain. Try to relax, get enough sleep, and consider using cold packs on your forehead. If it doesn’t improve, it’s best to see a doctor for further evaluation.

These symptoms together with unintentional loss of weight are worrisome. This could happen for many reasons including pulled muscles or problems with the cervical spine but it could also be something more serious so I would advise seeking medical attention soon so you can find out what is wrong before starting any treatment plan.

Excessive yawning and feeling sleepy even when there are no other symptoms can sometimes be due to lack of proper quality sleep. It is also linked to the feeling of being slightly down or the deficit of air. Try going to bed earlier and have a good sleep routine. Get outside for a breathe of fresh air each day to be active a little more.

Lack of vitamin D levels in the case of multiple sclerosis patients may be responsible for muscle pain on some occasions. You should be getting enough vitamin D from sunlight or a supplement of vitamin D. Besides that, you can try to make the tension loosen or apply a warm compress to stop the pain. If the pain continues, go to a doctor to get professional advice.

Tinnitus is not a disease but rather a symptom of something else. It may be due to circumstances such as exposure to loud noises, ear infections, or even stress. Unfortunately, no medication is specifically designed to cure tinnitus. Nevertheless, coping with stress, limiting exposure to loud sounds, and applying sound therapy can reduce the symptoms.

Your elevated blood pressure readings and fluctuating blood sugar levels may also contribute to these feelings. The medications you've received, including antihistamines and antimalarials, should help address your condition. However, if dizziness persists or worsens, I recommend reaching out to your healthcare provider for a follow-up. They can offer further evaluation to ensure you receive appropriate care and guidance.