In reply to Stopsy:
Wouldn't bother with the Japanese Encephalitis unless your planning on sleeping rough in farmyards. I think you have to be in fairly close proximity to pigs to even risk catching it.
As for the nut allergy, I went backpacking round Asia with someone who had severe (like, death if she looked at one) nut allergy once . Apart from the general paranoia she seemed to cope fairly well. She had notes written in the local languages that she could show to people at restaurants, which a picture of some nuts with a big cross through it (no joke), which seemed to work well. When she wasn't 100% confident they'd understood the note, she would ask to watch them cook the meal, and if in doubt would just ask for plain noodles. She also had a huge stash of nut free food that she brought with her incase she couldn't eat anything and was starving. She also had enough epi-pens to supply a small hospital.
The biggest hassle was having to call her mum every day to report that she was still alive, but that was before WhatsApp and free wifi.