My mom also has other medical problems, including constant nausea for the past 3-4 years. No one can determine the source. She forgets that she has just taken her nausea med and asks for it every 5 minutes until it is due 3 hours later. Same for pain med and anxiety med due every 4-6 hours. Night after night after night. She seems to be OK about it during the day but as soon as the sun goes down, it starts up (sundowning?) again. Any advice would be appreciated!
I would consult with her doctor to determine the reason for her nausea. Maybe it's some med she's taking, a food issue, or something else. Solve that if possible, but if she still continues to request meds over and over, it could be that she just doesn't remember that she has already taken it. In that case, there is no real way to fix that.
You can post a chart of when she takes her meds on the wall and allow her to check it off or put stars on it, so she can see she has already take the medication, but that may not work well. I found that with my loved one, notes on the wall and things like that did not ever mean much to her and she would still repeat the same thing over and over. That stage didn't last long though. She no longer repeats things that much, but she has advanced with other issues.
Sadly, you just have to respond to her each time as if it was the first time. That can be very stressful. She may eventually ask for meds every waking minute.
You are already disabled. Do you have any plans for the future care of your parents as their conditions progress? I would really give that some thought as this type of behavior is only the beginning of challenging behavior in most dementia patients. I wish you the best.
I might also suggest that it could be anxiety that is making her nauseous. That is not uncommon. Ask her doctor about some medication for anxiety or depression. If it addresses her anxiety, it might cure the nausea too.