Fuck! this became interesting
I agree that engaging in physical exercise can help.
(not because it increases your testosterone or anything so crude, but rather that it decreases inflammatory signaling in your body, which is a side effect or sometimes even the cause of depression)
Porn can very easily satisfy our sexual needs and need for pleasure, so it very easily becomes a (less-than-satisfactory) substitute, and sometimes even an addiction. I don't think you should feel guilt or anything, but rather see it as a challenge or as a habit you wish to change. With emotional disturbances such as the ones you mentioned, developing such habits is very usual. See sex not as the ultimate goal, but rather as a sign that you yourself are feeling better.
You're lucky that your partner is understanding! How about a weekend away on a camping or road trip with him? Doing something like that together helps form new experiences and memories, thus enabling you to incorporate him into a new context. You'd also find the excuse to keep away from internet porn.
I said camping, because there, you can also do something physical together, which helps you on both the exercise part, the stress relief part, and also taking a break from it all. (or I might just be fantasizing messing around in a tent in the woods.)
Whatever you do, though, take it easy and don't force yourself. Sex between you and your husband should come naturally from within, not from a sense of duty or obligation.
one last word: if you feel like you need professional help, go for it.
As it turns out, it was really just the odd confidence issue hampering my ability to confidently communicate my sexual desires.
Tldr; had some great sex and feel like I could speak up better in the future.
Seemed like an orgasmic experience, I'm glad
Now this is that good shit I wanted to hear <3