Dealing with Chronic Dizziness and Numbness for 7 Years

I’ve been dealing with dizziness 24/7 for about 7 years consistently it never fades it all day standing, laying down, sitting doesn’t matter. I have numbness and tingling everywhere hands arms legs feet left chest and rib area. I have severe headaches and panic attacks which causes my whole body to stiff up and I can barely move. I have leg cramps arm cramps leg weakness sometimes paralysis and many more symptoms that comes and goes but those I mentioned is persistent everyday all day. I’ve done every test a neurologist has to offer and haven’t been diagnosed yet. I’ve gotten frustrated and just learned to live with these symptoms and don’t know what else to do. It worries me I won’t get help and could become disabled or fatal from this illness anyone know anything that could help. Thank