Hugs. x
I also had thyroid problems after DS2 was born, and it completely knocked me sideways. Have they said what the problem is exactly? I was overactive, and was very anxious, and spent huge parts of the day in tears.
I think it is worth speaking to the HV, if yours is any good. If you can get to your local library, they often have a good section on childcare et, and it may be worth borrowing a few books with different ideas for routine and meals.
The main thing is to be consistent. Write it down, and stick to it. If you have a bad day, just try and stick to the main bits.
Personally, I would work towards:
Morning milk when wakes up, then breakfast at 8ish;
Wash, dress (you and baby!);
get out of house for a walk/activity. Snack mid morning (finger food is ideal), and milk if still wants it (both mine dropped this feed at around 7 months);
Lunch at 12 noon (try and offer water with a cooked meal );
nap (gives you a chance to have a rest too)
Mid afternoon milk (which will turn to a snack eventually), and try and get out again;
Tea between 4.30pm and 5pm (cooked or finger food with water);
Bath 6pm;
Milk and stories/nursery rhymes etc) at 7pm.
I may be a bit out, as my boys are a bit older, but this is the rough routine we used and still use to a great extent now.
Keep chatting. xxx