Hi! Do not fear, there are tons of stretches you can do that won’t make you dizzy for your back.
Here are some:
Be careful of your neck when you do this though, try not to squish it and adjust so it’s comfortable.
Tear drop stretch:
Work on pulling your feet either higher up or closer to your head like this:
Yoga cat poses:
The superman exercise will help you build up back strength too:
Spinal twists are always good for general back happiness!
Also, depending on how flexible your legs are, doing things like scorpions and wall stretches like this will definitely stretch your back too:
Make sure you lean backwards to increase the stretch.
I hope that you find some of these stretches effective!