stomach won't settle

for the past 2 days the first day I woke up at 3 am throwing up til 9 am the whole day my stomach was all bubbly and felt queasy then I threw up a little that night and today when I am still having a bubbly stomach (constipation along with it) I'm not sure if its a side effect of my nexplanon removal I got it removed on the 8th and feeling a little off since. Or a stomach flu or food poisoning I started throwing up an hour after eating a lot of potato salad from walmart or maybe pms. ( if I if this makes a difference but when I used the bathroom after I threw up there was dry white cm on my underwear) I don't think its pregnancy bc I've been feeling weird symptoms 2 days after the removal. I took an antacid and anti gas magnesium supplement but it didn't help since I had the implant removed (2 weeks ago) I have had slight pelvic cramps, bloating, nausea.