Sick and tired

I'm looking for encouragement to keep going and/or advice on breaking my fast.

The last time I fasted 7 days and I felt great days 4-7. I am currently on day 17 of what I am hoping is a 40 day fast. I have not felt great a single day of this fast. I have been so tired! Many people suggest supervised fasts, remote locations, summer fasts, etc all of which I find very unrealistic.

I haven't seen many posts where the faster is still working, cooking 2-3 meals a day for family, running kids to sporting & church events, etc. We have been snowed in for about half of my 17 days, so I haven't had to get out as much, but I have been sleeping what seems an unreasonable amount of time.

This week, my whole family came down with a bad cold. Mine doesn't seem to be as bad as everyone else's, but I still feel terrible b/c I am so tired. I have been considering breaking my fast, but am nervous about doing it while sick based on what I've read. I will also feel terrible about not even making it to the halfway mark of my goal.

I don't know if it has any bearing, but I am considerably overweight and have lost 25 lbs. I was hoping for more and I am afraid of how much of it I will gain back when I start eating again. I have continued taking my synthroid, birth control, multi-vitamin and fish oil. I tried a couple of days without them this week and slept even more.