Help with intolerance

I knew I was becoming more sensitive to dairy but this is the first time it’s made me really ill. I ate some custard last night with my husband and throughout the night I got some cramping and now it’s been non stop all day today. Did vomit once this morning and have been going to the bathroom though not diarrhea. I tried some Tylenol which helped some, but not much. Eventually I ate some bread but realized it may have dairy in it so I went to the store and got tums and Lactaid. I took the tums (hoping the doing have dairy in them, I’m in so much pain I just needed something) and the lactaid. I vomited almost immediately. I drank some tea and ate some almonds to have something in my stomach and that did not help so I tried the tums again which I kept down for a bit then tried the lactaid again and again threw up immediately. I’ve never been through this before and don’t know what to do. Is it normal to throw up Lactaid when you’re going through these symptoms? Any other advice for relief? I’m so nervous and just doing want to be in pain.