Dealing with Meningioma and Radiotherapy Side Effects

I have three meningioma’s one of which I needed an emergency craniotomy in March 2020. Just finished 30 zaps of radiotherapy on the part they couldn’t risk trying to remove as started growing and was way too close to main artery so I still have two and awaiting an MRI in February to see if there’s any change hoping there is, I appreciate all that’s been done to keep me here, just can’t take in that the radiotherapy I had for leukaemia in 1988 caused these. Has anyone had anything similar as was told I’d ‘slipped through the net’ but feel alone!