Why does my brain feel tight and rock-like?

When symptoms disappear, it indicates that the treatment is working. For nerve problems, the patient should gradually change medication. The body needs time, usually a few months, to adjust to a new dose before considering reducing it. If you rush this process, symptoms may return.

As of now there's no permanent cure for Parkinson's disease..But there aare also various treatments to imporve the quality of life

You might be suffering from stress or fatigue. When you start getting a hot and closed head and you often find yourself in a state of amnesia it might be a sign that you are tired and your brain is asking for a rest. Take breaks while studying, drink plenty of water, and give your body enough rest. 

It seems you might be dealing with Mixed Connective Tissue Disease (MCTD) along with Myasthenia Gravis (MG). In this condition, the immune system attacks healthy tissues, leading to symptoms like muscle weakness, fatigue, and shortness of breath. While there is no miracle cure, treatment options can help manage the symptoms. With the right care and treatment, many people can still enjoy a good quality of life.

It may be due to stress or anxiety. In such cases, it is advisable to practice mindfulness meditation, deep breathing and some relaxation exercises. Also, knowing the cause of your stress and anxiety may help. If the problem still continues, please consult a reputed doctor to address the issue. I hope this helps.