inescapable and never ending in-water glitch

It occurs as soon as I enter water...

The glitching, almost seizure like movements begin straight away. I can swim forward, backwards, side to side fine, but if I was to travel upwards, pressing the space bar, the malfunction occurs. There is nothing above me, I'm not making something out of nothing. It's almost like a time jump and it sh*ts me to tears.

Now look... it isn't great, but I've learnt to deal with it. It is only now that I am starting to take survival games or multiplayer server games seriously (such as Hunger Craft) that this disadvantage has struck home. There is only so many bubbles I could see pop before I decided this was my best option. 

 

I have updated, turned off and on again, switched from Mac to PC, partook in Church on a Sunday and started Yoga lessons. I swear nothing is helping. I'm just asking for a friend.  

 

(SIDE NOTE: Don't even get me started on entering doors - or should I say not being able to - water and doors, the two thing one should never live without. The thought of them rejecting you over and over is heartbreaking. Please send motivational quotes).