Nausea, continue 20 mins can not speak.

Since 14th Thursday having nausea and vomiting. Vomiting was only one day. 2-3 time . But nausea is still there. Specially more in morning hrs and in rest of the day also but that is less. I have taken some medicine as per my G.P. consultation he gave me 1 capsule to take 5 days before breakfast and antacid gelucil liquid. Which I am taking. Still nausea has not gone. I was suppose to get my periods on 18 th but this time on 9 th only it started some spoting on 9th and some bleeding on 10 th till night only there was not at all bleeding. Usually i have proper flow for 3 complete days. After 2-3 days i was feeling weakness. After that from Thursday this nausea thing Started. As per G.p . consultation i have done Hb which is normal. I have done serum HCG also on 23 May . Pls can u tell me what could be the reason for nausea And how i can stop it? And why did I not got my normal bleeding. My job needs continues talking 9 hr duty. When I speak for 15 min continue have feeling like have run