Hello Alice,
Many thanks for your message. I'm sorry to hear that you are not very well recently because you have been getting overweighted, and catching flu very often. I think that it's getting cold in your country on the one hand, and you are lack of exercises on the another. I suggest you should take healthy diet as much as you can. Don't take junk foods any more, such as your favorite fish and chips.
You should participate more exercises like running certain distance everyday, or go swimming regularly. I believe that you would benefit from these activities both mentally and physically.
Take care and all the best,
Li Ping