Hi, my doctor consulted me for Megalis 10mg. But since it was not available at the chemist they gave me same salt medicine Forzest 20mg having (salt Tadalafil 20mg ). I took this tablet once and started feeling a slite un-easiness. After 2 days I again took a half dose of this tablet and then it all started. Severe headache + body pain + eyes pain+ samuchit upset+ cervical pain+ nerves tightening across whole body+ feeling lethargic. I took the last dose of half tablet on 10th Saturday, June and am still feeling the same though a little bit less. Please suggest what should I do?