Is therapy considered lifelong for people with ocd?

The thought of ocd being long-term is scaring me pretty bad. My therapist told me in our first visit last week that it will always come back and it triggered me. I know everyone says it’s manageable, but I keep having the thought that I won’t be able to handle it the rest of my life and I will want to suic. myself. I am terrified :(

Is it normal to think your therapist does not know how to treat ocd? What is a good therapist in ocd?

I have this idea that if i stopped my current ocd it will comeback again in another form. Forexample, when i was 9 by the help of a doctor i stopped washing my hand every 10 mintues but then ocd switched into another theme, which is religious, and when i stopped that it again changed. And now i have prefction and mental ocd. So my question is why bother trying fix something isn't fixable? It takes a while to notice that the thing you have been doing is ocd, double the time to treat it, is there a permenant treatment or is it just tourture ? P.S sorry for my english i'm not from the U.S