Hey Marlene, welcome to the forum, it's great to have you here
Thank you for reaching out here, I know that must not have been easy. And I can relate on some level to the nervousness.
I'm on the search for a new style too, and I've checked out a HEAP of dojos, and trained with most of them for a bit. And I get super nervous too, I really don't know why, but it's a form of stepping outside my comfort zone, into the unknown, to a new place, with new people, and no idea how it will go. Even if I'm just going to sit and watch a class haha! But every time I've done so, I've been incredibly proud of myself, and I've never regretted it once. And the more I do it the more I realise that I am capable, AND very importantly that it's no big deal, and certainly not as difficult, scary or big of a deal as I imagined it to be!
I would suggest very small steps; baby steps are the best way whenever you're anxious about anything. Simply shoot an email to a school you seem interested in, asking them about the style and what they emphasise.
Then if that goes okay (and it's an awesome sign already that you indeed have the confidence already within you; this is already a big deal reaching out and it shows you your own capability), you can ask if it would be okay to sit on the side and watch a class. You can even explain that you're a bit nervous to do so, and the instructor will hopefully understand and make it a very easygoing process.
It sounds like you're super keen to get back into training, and I think once you start... wow you are gonna love it and wonder why you didn't sooner!! But listen to that little spark, that voice that is saying 'YES' to you... your own inner wisdom is your guide.
These are really important reminders for myself anyway: that it's no big deal, to simply be curious and open, and that there's nothing at all to lose. These take the seriousness or heaviness out of it, so that you approach it more with an attitude of playfulness and curiosity, instead of trepidation, anxiety and 'it's all on the line' sort of thinking.
Each step you take gives you a bit more confidence in yourself, and when you start training I'm sure your nerves will dissipate more and more until you're joy in being there overrides it

.
Best of luck and please keep us in the loop!