Possible medication withdrawal? Issues?

I was prescribed Clonotril 0.5mg first time ever by my gastroenterologist a year ago for nighttime stomach bloating that disrupted my sleep. After taking it for three months, he tapered off the dosage to 0.25mg for a few days and stopped it. I was fine for a few months. However, I've recently started experiencing random headaches, sleep disturbances, and anxiety at night which are new symptoms for me. My mind racing aimlessly with thoughts makes it hard to sleep. To cope, I've occasionally taken Clonotril 0.25mg on an as-needed basis, but I'm concerned that these symptoms are becoming more frequent and might be related to Clonotril withdrawal. I want to avoid relying on the medication again and again. My doctor says not to worry and exercise regularly, but I'm unsure if that's sufficient, as I struggle with anxiety and sleep disturbances at night and it's causing me stress. Please advise on how to address these issues?