1) will you qualify for medicaid or a subsidy? My friend who is a widowed single mom, bought a plan with low deductbles, but her subsidy cut the price in half. 2) Cobra your existing plan until you get a new one. 3) Do the math, but given your treatment you are probably better off paying for a gold plan with few deductibles than a bronze plan with hi deductibles. (I bought a bronze plan for 500/ mo, a gold plan was something like 825. I'm thinking about switching and getting everything I need done next year.) 4) if you qualify for Medicaid, take it! At least look at it.
Get someone you know who's good with numbers to help you compare plans.