Welcome to the forum. I'll try to help.
If you indeed have an oral papilloma (wart), it is not from the sexual exposure two weeks earlier. Warts cannot appear sooner than 2-3 months after exposure to HPV and usually it's 6-12 months. Oral warts are not necessarily sexually acquired. There are over 100 types of HPV, most of which are not sexually transmitted. Second, recent research shows that most people have various strains of HPV in their mouths at one time or another. The long term health implications are not clear; more research will be needed. However, overt warts, recurrent warts, and oral cancers are rare -- so probably the risk of anything serious is low.
I'm not an oral medicine specialist, and most of your questions are outside the expertise of STD specialists. But I'll do my best.
1) I'm sure there are many potential causes of oral bumps, skin tags, etc other than HPV. Your ENT doc will know the answer.
2) As far as I know, most oral warts clear up without any long term health problems. Again, this is a question for your ENT doc.
3-5, 10) I cannot tell you the risk of transmission through either kissing or oral sex, or whether you currently could transmit HPV (if that's what you have). This hasn't been studied. Auto-inoculation doesn't seem to be common for most HPV infections, so I doubt this is a serious risk.
6) I have no experience with oral wart treatment or the pros and cons of an oral surgeon versus ENT specialist. Sorry.
7) Yes, your immune system will suppress your oral HPV infection, if that's what you have. Probably every HPV infection persists at the genetic level, i.e. persistent DNA. However, that doesn't mean the infection remains active or can be transmitted. Usually not.
8) I see no need to discuss past oral HPV infections any more than genital. Whether or not you inform partners (whether sexual or kissing-only) probably isn't going to make any difference in whether or not they are infected someday, and not likely to have any important impact on their health.
9) Diet etc will make no difference.
11) Genital warts usually do not reappear after surgical removal. I assume that's also true for oral warts, but I have no experience. Again a question for your ENT doc.
You apparently have seen other threads that discuss HPV. Here is one you might look at, if you haven't already; it contains links to others as well. Although they discuss genital HPV, some of the principles probably apply to oral and to nonsexually transmitted HPV infections. The main bottom line is that having HPV, even with overt warts, can be viewed as normal, largely unavoidable, and rarely a serious threat to health.
http://www.medhelp.org/posts/STDs/concerned/show/980849
Good luck-- HHH, MD