TTC with symptoms but negative results

I have been with my Boyfriend for almost three years, and we’ve been friends for 8 years. We have been ttc for awhile now almost 2 years. We’ve dealt with two chemical pregnancies and a lot of false alarms bc I’m very irregular. I went away for a week and came back and we had sex for three days and now I’m feeling crazy. I have occasional dizzy spells and I’m nauseous every day. I’m tired and my breast feel fuller, I always had big breast and big Areola’s but I’m confused bc I have so many symptoms but my test are negative and I’m starting to wonder if my mind is playing tricks on me. On top of that I’m constipated and emotional. I don’t know what to do.