Hi there and welcome to the forum. Worms are a serious issue in goats so we need to help you get his load down. If his famacha is almost white Red Cell would be a good idea that helps with anemia.
Doseage for Red Cell from TGS Medicine Cabinet: 6 cc's per 100 lbs orally, 1 x a day for one week, monitor the inner lower eyelid color daily. If still too anemic after that time, continue 1 x week, until Famacha chart coloring is border line safe, stop, at that time.
This is a horse supplement to be used for anemic goats, please use care while using it can be overdosed.
You have a few different options for dewormers. If you haven't used them before and don't have a history of dewormer resistance on your farm, I'd start with ivermectin. That's 1cc per 40lbs orally for really anemic goats and then repeated in ten days. You can use the drench or the injectable version, both would be done orally.
Another option you have would be to go with an herbal dewormer. Land of Havilah's parasite formula is a good one as well as Fir Meadow's DWA and GI Soother.
Foods high in calcium like alfalfa would be helpful for his anemia. Also a few garlic cloves daily would really be a good idea.
Probiotic paste and injectable vitamin b complex are always great additions when a goat is unwell.
Since he is that anemic, it wont hurt to start on treatment, but it really would be a good idea to collect a fecal sample and send it to a vet or a lab (Meadow Mist has very affordable prices $6) so that you know if your treatments are working and to be sure that you are treating the appropriate thing.
Also as suggested by a very helpful person here, something called Dyne, our Co-Op has it in a quart bottle for, around $13.00. TSC has it in Gallon size but that was about $60.00 perhaps a bit much in quantity for goats.