Obtaining Reasonably priced Travel Insurance

Hi, I am currently experiencing renal cancer, with secondaries in my lungs and brains. The secondaries in my brain have seemingly been dealt with but I still have problems with my lungs.. I still take chemo.

I have searched the various travel insurance companies  send me a but seem to receive quotes that are greater in cost than the actual holiday.

I am sure that others must have experienced the same problem and I wondered if anyone could send me a list of potential insurers, or point me in the correct direction where I could find such information..

many thanks in advance,

kind regards,

Rodger