Received weed from sketchy acquaintance. No visible contaminants. 

Vaped with friend, 0.5g shared in a bag approx 3L

Weed did not vape well at all, came out light brown with greenish bits after vaping at 230c (usually combusts at this temp)

My friend is on SSRIs but smoking is fine for him.

Both had severe impacts upon nervous system shortly after inhalation. Incredibly tense muscles/shaking. My friend felt the onset of Serotonin Syndrome with a piercing headache. Both our brains felt very fried. 

This lasted for about an hour or so, then suddenly dissipated for both of us (albeit staggered). Left with aching muscles in back/neck similar to Delayed Onset Muscle Soreness and underlying weak weed buzz. We found it very hard to sleep afterwards, similar to insomnia.

Tried it again the next night with exact same results.

This is NOT panic/anxiety. We've both experienced this before. There was no thought loops/spiraling out of control/panic.

On the third day alcohol affected us both to a very high (and quick onset) level, with extremely unusual amounts of euphoria similar to a peak alcohol state lasting approx 3hrs with no 'fading' or 'tipping over' as is usual. 

We have felt high levels of anhedonia for 4 days following this and felt very 'fried'. 

I find it hard to believe that this is laced with a Rec drug as there was no euphoria during it. 

What would affect serotonin to a level enough to verge of Serotonin Syndrome, impact you like a nerve agent, affect GABA the next day and leave you feeling fried for days? What can we do to reduce the (probable) damage done?