Travel Insurance

I am trying to get travel insurance but am finding companies will not cover me, or the cost is very high or they do not recognise my condition. I am confused as I have travelled previously and not had this issue so unsure what has changed. 

I had a stem cell transplant and as a result have chronic GVHd which has been treated using ECP, I have not had this for a year now but still take steroids and visit the hospital regularly for monitoring. Therefore I must put it as a condition on my travel insurance quote. 

Can anyone recommend a company that might help? I have used Staysure previously but their quote is suddenly through the roof and when I asked why they stated 'market conditions' . I saw someone else on this chat recommended Insurewith but when I tried it did not recognise Graft versus host and the chat did not work.

Would appreciate any suggestions, thanks!