Will Sertraline Help?

So, I used to be on Sertraline (100mg) and I've been on them for about 10 years. I've gone down to 50mg every 3 days (within the past 2 months), but recently I have split with a partner- she wasn't very nice at the end, I'm having strange thoughts about her, nothing jealous- but I've been getting trapped in my thoughts. If I go back to Sertraline 50mg every day, will that stabilise my thoughts back to normal? I mean, I was on them for 10 years, so it's definitely not helping weening down.
Will Sertraline Help?
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