Dear , This is Dr. S. Tomar from healthcaremagic.com s medical team and I ll be your medical adviser for this question. First of all thank you for sharing your concern with us and showing trust on us. Muscle weakness with nausea is a possible side effect of sumatriptan. But some other serious conditions like stroke , TIA can also produce similar manifestations which should be ruled out with proper evaluation . Pain in chest could be because of different benign conditions but first serious ones like M.I. and lung problems should be ruled out . I would recommend to call/reach your local emergency services and get ECG , chest Xray and proper clinial examination done to rule out any serious issue first. This is my initial response and discussion is open until you have any query or need further clarification. I wish you good health . sincerely, Dr. Shardendu Tomar