I barely changed at all, accent wise, in 3 years, but after moving back to the US, I was back to my usual. Hubby has lived in the US a total of 7 1/2 years, when we were first married and then the 3 since we have moved back. He has this interesting combination, where people still clearly know he is British, but when he goes back home to visit people know he has lived in the States. It varies person to person, and your family and friends will probably enjoy hearing you when you speak, knowing your new life fits well with you. As mentioned above, they could be just teasing you, as they seem to do. Maybe have a heartfelt, calm chat about it if you can, and see.
As far as the spiders and flies and beetles, I didn't find it any harder to take care of spiders and flies in the UK than I did in the US. Regardless of how Brits feel spiders are harmless little house guests, my absolute, consuming fear followed me over there and I saw no need to have them in my home.