HELP!!! gnat larvae

Just watered my 6 week old plant a saw millions of small white worms crawling around the wet spots where i watered. in the dry spots there are actually gnats themselves. i think i got them when i had to put my plant into hiding in my attic for 4 days. please help me out. i have no clue what to do. and i really don't want to have to start a new plant from scratch again... Thanks Everyone!

1 get some azamax and do a root drench 2 put some sand on top of the soil an inch deep . 3 water less

Ismokealotofpot is 100% correct. Sand and azamax works well, and dont water as much...

Really disgusting. I hope You kill em all.
I'd also use a yellow sticky to monitor for adults.