very long post but if anyone else has had this happen please comment

moon
I've been super regular since 2014, every 22nd of the month, maybe a few days earlier some months. I moved back to a town I had lived in before 2 days before end of august period. Had sex with my boyfriend for the first time a few days later not even thinking I could have ovulated.  Flash forward to the 22nd of September his birthday, nothing. I thought it could've been stress from an abscesses bartholin cyst & my thyroid possibly acting up. Got a really funny feeling a few days before I completely missed my period. Started becoming VERY tired. Very vivid and weird dreams, Very hungry, driving in the car made me nauseous, & I started peeing way too often for comfort (more strange things happening just don't feel like boring you) . Took a test 2 days after missed period, neg. then again 1 week after. & 2 weeks after. All neg. I started cramping terribly last Sunday morning no bleeding, same thing Monday so I went to ER to make sure there wasn't an ectopic thing going on... neg urine test so they sent me home. Tuesday morning I had no cramps but a little bit of bleeding then had bm plus a scary tissue. Still no blood. I thought I miscarried because what came out was so weird. Then I just spotted brown with very light cramps till Thursday. Still feeling odd, even more so than the weeks before.