I did get in touch yesterday, and asked if you still needed help. I did not see your response to me until now. Sorry I was not online when you were last night.
I see that Cheeka is drinking; is she eating at all?
The first way to learn what is wrong with her would be to examine her: listen to her heart and lungs, feel her pulses, palpate her lymph nodes and internal organs, take her temperature, check her hydration, feel her back and legs for areas of swelling and pain, test her reflexes. Are her sides still twitching? That can be a sign of pain, but does not tell me where the pain is. Is she eating at all? If not, she is probably becoming dehydrated and may need supplemental fluids.
If her gums look pale, she probably needs to see a veterinarian as soon as possible. All you really can do for a cat at home is to keep her hydrated by offering water, Pedialyte, and broth. There are very few over the counter drugs that are safe for cats, most do more harm than good.
She really needs to be examined, to find out where her problem is, and to be started on pain medication.
You can check her for dehydration: Gently pinch skin over her shoulders and let go. It should go right back into position in less than a minute; it it takes longer she is dehydrated and probably needs to see a veterinarian to get supplemental fluids (IV or injected under her skin).
Let me know how she is doing. I will be online for another hour or two this morning, then later this afternoon. Rebecca