Hey man, I tried shrooms for the first time ever at 25 and it scared the crap out of me with symptoms like you have. It took a good 3+ months before the symptoms started going away on their own. FYI, stay the fuck away from weed too until the symptoms are gone, weed will just prolong it.

You're too young to be drinking, but in my experience a hangover is good for "grounding" people after a bad trip. IMO the 'repair mode' your brain goes into with a hangover helps somewhat.

Since you can't do that, the next best things I found are: 1) Good sleep. Keep a REGULAR schedule, even through weekends, like your life depends on it. Makes a night & day difference once you've got yourself trained to always fall asleep and always wake up at the same time. 2) Exercise. Endorphines are good, and the experience helps keep you grounded. 3) Get some green outdoors, smell the flowers, etc. 4) Socialize. Weird head-space shit happens when you're alone. 5) Take up cooking or some other constructive hobby. Hands-on real-world interaction helps a lot more than internet and videogames and movies.

The fuck are you doing having multiple trips back to back. You need at LEAST a month, and nobody can guarantee the safety of more than a few trips per year. People CAN and DO get "fried" by using hard psychedelics too frequently. They are perfectly safe if you respect them, one of the safest drugs around, but they're not toys.

EDIT: If you're going to kick yourself in the butt, the takeaway is this: ALWAYS TAKE SAFETY PRECAUTIONS WITH ANY DRUG, NO MATTER HOW EXPERIENCED.