Ok So Yesterday While I Was Brushing My Teeth I

ok so yesterday while i was brushing my teeth i started gagging really bad. everytime i'd start to gag i'd stop for a second & then continue to brush. just when i was almost finished brushing, i vomited right into the sink. hadn't eaten anything that morning before brushing, but i always brush before & after i eat breakfast. i've never had gagging or vomiting while brushing my teeth before. not gagging that bad anyways...i have been experiencing some gagging while brushing for about a month though. that's all though. took 2 pregnancy tests, both negative. the first test i took was at the end of April, & the second was in mid-May. so idk what's going on right now. lately i'm almost always constipated, gagging when i brush, seem to be craving spam, & i'm tired a lot more than usual. i have not had a period since January, irregular cycle flow comes every 3 months on the nose usually. give or take a couple of days anyways. that's why i tested in April & May. Any ideas??