dear Audrey, is it fair for your husband to blame you, surely not, as your teenage son is going as far as he can, and therefore testing your limits.
Does your son want something that you disagree with, but your husband feels that it will be alright, you may let us know about this if you want to.
Overcoming depression is always a great feeling, the weight of this illness lifted off our shoulders, but this doesn't necessarily mean that we will be free from relapsing, this can start at any time, if our situation worsens, and this happens more times than not.
Unfortunately we can't avoid this, all we can do is to go into our survival plan, that is, the same way we were able to overcome it before, if that is possible, to contact our doctor and ask for a referral to see a psych., but you have to keep in mind of the pressure that maybe causing this to happen, and this may not be easy to do.
And in your case this maybe a difficult part to your problem, as it seems as though you have both your son as well as your husband both ganging up against you.
I hope that I am wrong. L Geoff. x