Usually PRN's are good every 4-6 hours but yes it depends on what you're doc is recommending. I've been known to take 50mg Seroquel but it would be irresponsible for anyone to tell you to go ahead. There are so many factors to consider. We are supporters not doctors. Sounds like you have some really good support if possible use them as you would a PRN. I had a pretty bad afternoon but rather than taking my PRN, I call called one of the people in my support circle. I'm not 100%n but better than I was before with no med side effects.
Hang in there