I agree with what Anvil said. It's so common that wives of addicts keep the addict's secrets and then find themselves completely alone because of it. So I'm glad there is one friend there you can talk to. But if it's addiction--not just your husband abusing drugs for whatever reason, but instead is true addictive disease--then your friend will not be the person to advise you. I am 99% sure she will tell you all the wrong things (unless she tells you to talk to a professional).
I understand the numb feeling, too.
Let us know if we can support you anytime you need it.