I've also done IV infusions. Started feeling better after about 2 sessions and after 10 I felt better than I can remember ever feeling. But it didn't last very long. The effects started to wear off after about a month for me, and I was back to my normal depression after about 2 months.
But I'm told that the effect can last up to 6 months or so. It's definetly worth a try. The treatment itself was nice; just lying in a room high af :)
(Mind you, I live in a country with universal healthcare, so I didn't have to worry about cost.)