Congratulations on your diagnosis and welcome to the community!
There are a lot of other late-diagnosed people here, so it's a great place to share your thoughts and/or just to pick up tips and learn by reading others' posts.
The NAS has a great set of articles focused on "after diagnosis", including one covering how you might feel during the subsequent days / weeks / months. You might find them of interest and/or helpful:
Talking about and disclosing your autism diagnosis
Emotional support for family members after a diagnosis - (which might be of some help in respect of your husband's initial reaction).
Formal support following an autism diagnosis
What can I do if formal support is not offered or is not enough
In terms of what to do next, my advice would be to try and give yourself some time and breathing space to process and absorb everything that you've been through, and let your feelings settle down.
As for many others here, my diagnosis turned out to be much more of the start of a new journey, rather than a conclusion full of instant solutions for my various ASD-related difficulties.
Therapy (or counselling) is often recommended after a diagnosis, as a follow up action for your GP to arrange. In anticipation of that, you might find it helpful to borrow or buy this book, which includes discussion of various types of therapy and counselling, together with advice on choosing the right therapist or counsellor - all from an autistic person's viewpoint. Several of us here have found it very helpful, including me:
