Canceling wedding due to sickness

Hello! I was originally supposed to be married October 2020. However, due to the pandemic and personal sickness, we postponed to October 2021. Without getting into too much detail, last year I was diagnosed with an aggressive tumor and had multiple surgeries leading up to the original date. At my annual check up, I just found out that I have another tumor and will need multiple surgeries this year too. I may also need treatment. Now that surgery is a definite, FH and I have decided that wedding planning was only stressful and we’d rather just have a small wedding with immediate family once my doctor clears me. This likely won’t be until next year. Last year when we postponed, FH’s parents called me “selfish” and said I should have just sucked it up for one day. Now, they are saying that I am selfish again and they don’t understand why “a week isn’t long enough for me to recover.” His family is NOT contributing or paying for the wedding. But their comments still hurt me deeply because we expected compassion from them. FH no longer wants to speak to them because of their behavior. However, I am very sensitive so now I am questioning if I am being selfish. Should I go against my doctor’s orders and have the wedding to avoid drama? Or should I do what’s best for my health and enforce boundaries here? I didn’t want conflict with my in-laws but it seems unavoidable at this point. Thanks in advance!