Isambard Crater, you are feeling fragile at the moment you have a number of pressures on you. Sorry to hear of your difficult situation. The logical thing is to slow down and avoid those areas of your life causing the stress which is of course the religion.
Tell your friends and family that you are weak, worn out and depressed. There will be sympathy for you on this since many JWs talk this way in the first place! So tell them you need some personal space to recuperate and skip some of the meetings and most of the field service. (I do find it a puzzle how non-believers can preach the WT lie with a good conscience?) If you make your position clear that you need private time it will alert them to the fact that you are sliding and that is good to establish because they will get used to it and ask less of you.Thank the elders for offers of "shepherding" but firmly and politely decline. You can remain a JW as long as you don't verbally express doubt or criticism of the org and its doctrines.
It is a fake organisation which uses theocratic warfare, so don't be afraid to you your own "TW" back on them!
Fading like this gives you time to build up your health and confidence to do what you actually want in the longer term. So don't rush it, just gradually fade and you know we are all gunning for you.