You need to go and see a speech therapist as soon as possible - they can help you with issues relating to difficulties with swallowing etc - they do not just treat people with actual speech problems but all sorts of other conditions as well.  Please do something about this before you suffer a serious choking issue which could cause aspiration pneumonia.
https://www.healthline.com/health/aspiration-pneumonia

Drinking any kind of Liquid now results in my Nostrils being Flooded, lowering my chin and taking small sips does little to prevent it from happening, tilting my head back slightly causes me to start choking, so yeah.... not the best idea.

Liquid fills my Nasal Cavity... Oh Goody