I'm really struggling right now and my therapist keeps cancelling

Just as the title, usually I have a weekly session but my therapist has been cancelling last minute quite often the past several months. I'm not upset with them specifically, they're dealing with something challenging in their own life and it's always a legit reason, but I'm finding it really hard on myself. On top of working through a lot of trauma, I've been in crisis mode dealing with a cancer scare and subsequent surgery. I don't have family for support, don't feel like my friends are close enough to share (and don't want to burden anyone anyways), so I'm dealing with it alone (as always). Even though even a weekly session isn't enough lately, having to wait sometimes weeks between sessions is so difficult.

I found out this week the cancer wasn't fully removed so I have to go through surgery again and who knows what else. I'm at the point of thinking of ending things; my life feels pointless and it's a constant series of Terrible Things that get worse and worse. And then my therapy session was cancelled again, 15 mins before, and it honestly just feels futile to keep trying.​ I've been "trying" my entire life and just keep getting knocked down over & over with things that 99% of people my age have never had to think about.

Just a rant I guess, sorry. I'm exhausted and don't know what to do.