It's good that you've made the decision to stop, and that you reached out for help!
Withdrawals are better assessed by a doctor, especially if you've had hallucinations or seizures. Knowing they can happen doesn't stop them from damaging your brain permanently, or worse. They can be avoided altogether with supervised detox. A medical bill is better than death, even without insurance.
Day three is a hard one, but you're already on your way past it. Monitor your temperature, drink plenty of water and have lots of healthy food in hand. Some vitamins too. Warm baths with Epsom salt may help relax your muscles since shakes may leave them feeling sore.
Really though, with vivid dreams/hallucinations/seizures, call a doctor. It's much safer. They will also get you involved in outpatient programs.
Insomnia, shakes, brain fog will go away in a variable amount of time. Distractions are key...something funny on Netflix etc. even if you can't sleep, try to rest. Once you feel slightly better, 15 minutes of exercise a day will do wonders.
You'll make it. If the severe symptoms persist, definitely try to find medical attention. Google can help find places for uninsured residents in your area. Hugs!