How do you handle that sick to your stomach feeling in relationships?

like if you get in a bad fight, think you may get dumped, you get jealous, etc. there is that nauseating feeling in the stomach, i don't know what to do when i start to get these feelings.How do you handle that sick to your stomach feeling in relationships?
Fix the trust and communication issue. the thing that causes those feelings is the idea that you don't trust that your girlfriend/boyfriend is faithful to you. The way I've always dealt with arguments is the idea that if someone was to die after I hung up on them because I was pissed off, I could never forgive myself for being an idiot and not settling it as soon as possible. Don't watch your words around your partner because your worried about what they may say, let them know exactly how you feel about everything.How do you handle that sick to your stomach feeling in relationships?
Pepto Bismol.
talk to a trusted friend.