RFHawks-
DUDE! Your daughter is sooooo lucky to have this time with you!
Don't let her see you stressed out! (she will stress, and stress you more)
Our children's cries actually affect us more than they do anyone else, because as their parent, our brains are wired to respond! Try not to let the effects mess with you while you are stuck in da haus.
My 3 Golden pieces of Stay-at-Home advice:
*Play, walk, maybe bike (you can put a baby seat- they are 40-50lb capacity on back of an adult bike + 2 helmets= yay freedom!), go to the park, play ball, water the plants---- just make sure to do something OUTSIDE everyday for at least 20-30min, before you get to lunch & "naptime."
This is a key element!- going outside for fresh air breaks up the day, helps establish your routine, and most importantly
helps immensely to relax the 2 year old child and set the tone for a good day. And hopefully get outside again a bit in the afternoon too, even if you just walk 2 blocks (a longer walk for her than to you), to pick a flower, or to get the mail with her. (Don't forget the SPF & H20)
* No (or extremely limited) TV helps enormously too--- maybe just a little Sesame or something in the AM if you must... become aware of any "background noise TV" going on in your house which can be very overstimulating for a 2 even if they aren't actively watching it, leading to annoying (attention-seeking) behavior.

Try to watch your TV at night or when she is elsewhere, as daytime TV is likely to be brain melting.
* Read lots of books with her instead... make stuff with play-dough, make your own play-dough, make art, let her "help" you cook and do simple chores. "It will take you twice as long to get the job done but it is true quality time."(Mother's Almanac)
😍
Hope this helps. Kid-sick clean up is the worst.
I'm sure you already looked into allergies like dairy/wheat.... hope she grows out of -- mine did!!!
Eisen
Who apparenly has a lot to say about this subject