I am suffering from a medical condition where I expect to get paralyzed from head to toe in a year or so and unable to eat or breathe without assistance. Is it permissible to commit suicide in such a scenario?
No.
Suicide is a major sin. Believers in Allah (SWT) never think about committing suicide under any circumstance. No matter how big your difficulties are, you must keep hoping the mercy of Allah (SWT).
The Mercy of Allah is greater than any difficulty.
You should always seek the help of Allah (SWT) and keep taking His name YA RAMAAN YA RAHEEM
Wassalam.