male im 32 burning sensation all over of and on floating black spots in vision rash in 1 spot on foot red in colour tiny buble

This may be a systemic problem that requires an infectious disease workup. Another possiblity is thyroid disease, which can cause heat intolerance. Also, the hypothalamus in the brain regulates temperature and if there is a problem there like a brain tumor, this can cause body temperature fluctuations. This can be easily evaluated with an MRI of the brain. Finally, sometimes depression can manifest itself with physical or neurological symptoms.