If you got herpes from this rimming encounter, you would get hsv1 genitally, not hsv2. The number indicates the strain, not the location. If you've ever had a cold sore/fever blister/oral herpes sore, you already have hsv1 and can't get it in a new location. You may already have it and not know it, since most people don't know they have it.
I found this for the UK, but know nothing about them. Check them out thoroughly before giving them your money - https://www.medichecks.com/herpes-tests/herpes-i-and-2-igg-antibody-profile I have no idea if it's a scam or not. Also, it's not anonymous. Probably no herpes testing in the UK is. It isn't in the US, either.
The UK doesn't really like to do blood tests for herpes.
That said, it doesn't sound like you have herpes. You could have hemorrhoids, anal fissures, etc. Tingles can be from so many things - herpes is way down the list, so work with your doctor to find the cause. Anal fissures can cause that, too, if it's pressing on a nerve.