Any suggestions would be greatly appreciated

I had my lo 6 months ago and decided not to get back on birth control bc we are ttc#2. I am now having my period every 19-21 days which I know is normal for y our body not to be the exact as prepregnancy but I am sick 2 weeks out of every cycle. I constantly feel like I’m pregnant. Sore breasts, exhausted , headache started this time around and nausea. I can deal with all of it but the nausea is killing me. Is there anything out there that I could take to help with the symptoms? I hate feeling like this all the time and also getting my hopes up that I’m pregnant each month.