Neck pain, thumb shaking and breathless.

My left thumb shakes a lot when i bend it. I have the left side of the back of the neck pain worse after stairs or sleep especially sleep. I have a constant bitter taste like tablets in my mouth especially after exertion like stairs. I get breathless often during stairs. Start to feel breathless through my nose first and i start breathing heavily by 7 floors. Heart rate goes 150 during 7 floors of stairs. I recently had an MRI due to random numbness which came back with sinusitis. I just came back from the stairs and my symptoms were shortness of breath at the start turning into mouth heavy breathing, My neck pain just got worse while i was going upstairs although i had a food polythene in my left hand. Bitter taste also started happening after the stairs. Neck pain is more like stiffness. Like i look up its really bad but when I don't do that its there but not as much. Just worse when i look up. The thumb shaking started happening after that aswell. POTS, Bisoprolol 2.5, twitching.