Hi there,
I struggled with anatomy. I got a 78 on our first exam after killing myself studying, remediated another exam (by ONE point), ended on a B, also ONE point away from a B+ lol. 96 on the final though!
I went to my prof several times to go over test-taking strategies and also how to sort of know what she is going to test on. Turns out I was overthinking things and going into too much detail where I didn't need to, and not enough detail where I needed it. If you haven't taken this step yet, go talk to them!
It lowkey haunted me through the next couple of ortho classes, especially the very next semester. I had to re-study anatomy a lot to get caught up on where everything was so I could figure out why they were moving the way they do. The good news is you will go over anatomy in future classes, over and over and over, and I found it easier to learn when it was attached to meaning and function vs just flat OIBNA tables etc. So don't worry - you will get the info down. After going over everything again and again, I got it down fine and no longer felt like it was a weakness. I had to work at it, but it's by no means a show-stopper. I got B+/A- through my ortho courses and my overall GPA is a 3.6, so ultimately, struggling with anatomy in no way ultimately hurt me.
As for online....I didn't take it online so I cannot imagine what an extra challenge that is for the course. I think when you're back on the ground, things will fall into place more easily for you.