I would say because you enjoy them and it gets you outside, just keep them until you feel like you just can't do it any more. There is no telling how you will feel by the time winter gets here. You can also do your chicken chores in parts. Like, in the morning you get eggs and feed them. At night you refill their water etc. Or have a chair out there. Do one task, then sit and watch, relax. When you feel rested, do another task. It will at least get you out of the house. Spend more time enjoying your chickens while you have them. Just suggestions. I hope you will start feeling better soon. I understand there is a lot of pressure on you to change. Change is hard. I get it. Your decision. I know i am a lot more active since we moved here. I feel better because of it too. I think it would be a mistake to get rid of the chickens, even if you need to get someone to help you.