sounds like you are taking way too much promethazine.....I truly don't know how you are able to function with the amount you take. a 1/2 pill knocks me out for a day. the constipation is from taking that med also.....you really should ease up on taking it. I would think for a car ride that might give you some motion sickness that Dramamine would do the trick......but not sure I would take it along with the Phenergan. as far as lack of sleep.....I find that the less I sleep the better I feel.....I get about 5 or 6 hours a nite.....if I sleep longer I tend to feel "hungover-ish" the next day. if you want to enjoy the summer you need to try and do some things out of your comfort zone without over medicating.....save the Phenergan for when it's truly needed.......which i'm sure you will find out is not very often.....you will feel much better without it......have fun at the beach......you'll have lots of distractions to keep that emet away...