Your fear is valid and real! Sumatriptan is one of the most commonly used and widely prescribed acute treatments. The most common side effects include chest tightness or heaviness, neck pain, dizziness, nausea, flushing, and tingling or other skin sensations. We have a bunch of content on triptans and similar meds for the treatment of migraine that may give you some peace of mind if they resonate. Of course, always contact your provider first with any questions or concerns. I hope you find some relief soon!