Holiday insurance

I am going to America in June and wondered if anyone can suggest a travel insurance company.

I was diagnosed with Stage 4 Bowel Cancer in March 2018 which has spread to my liver and lungs.  I am currently having chemotherapy which ends in April.

I had to go to America last year without travel insurance, which I really didn’t want to do, but couldn’t afford the cost which was going to be over £10,000!

Any help would be very much appreciated.