As you're still here 2 weeks later, appendicitis seems unlikey
Mine went haywire on 5 occasions before it finally came out. I was ultra sounded to check for stones poked and prodded around by several doctors, went to A&E on the advice of one doctor and no one seemed to be able to find out what was wrong. Finally after another attack a locum doctor at the surgery referred me to a specialist at Lewes hospital. I described what was happening and he looked at my notes and told me it was my appendix flaring up, effectively an appendicitis starting but then settling down again after 24 hours or so. He said it might never go nuclear but based on the fact that I travel a lot for work and there are places with a worse health system than the UK he felt it best it came out. I agreed, not a difficult decision considering how bad I felt during an attack. He opened his diary said when do you want it out and we agreed on a date around 7 weeks later, he could have done it in 4 weeks but I had work commitments. The pathology results showed it had been the problem and it was inflamed when it came out.
So although it's unlikely that you've got a dodgy appendix don't rule it out. I saw plenty of doctors all of whom took the situation seriously and sent me for all manner of tests but none of whom had thought it might be my appendix.