I had an episiotomy and it was more than 7 months before we succesfully DTD. Probably more like 9-10 months before it was completely comfortable.
It is possible you have some 'pouting' (i think it's called) in the scar tissue, which can be tender. If you go to your gyno they can check it out and remove if necessary. NOTE - it's super super super painful when they do that. Well, not so much the removal as the cauterising afterwards. It will sort itself out with time anyway so up to you.
Just take it slow, use sylk, and talk it all through with your DH. It will get better eventually, and in the meantime there's other stuff you can do.