What are you taking or doing for detox? I had lots of head pressure, head pain and eye blurriness, but none of the other symptoms you mentioned. I don't know what it is but it's possible you have ammonia in your brain and other parts of your body. Detoxing could be helpful for you.
Here's what I've used for detox and now I don't suffer with the head pain/pressure and very little eye blurriness:
Neuro-Antitox CNS/PNS™ - for those suffering primarily from problems in the brain, meninges, and peripheral nerves from Lyme toxins and heavy metals. Indications include, but are not limited to – cognitive disturbances, dizziness, and vertigo, disturbances in vision, neuritis, neuralgia, numbness, palsies, and headaches.
Ingredients – Silphium and Salvia Azurea as well as the sarcobioenergetic potencies in P6, 12, and 30 of cerebrospinal fluid, dura mater, cerebellum, optic nerve, substantia nigra, cerebral cortex, cranial nerve VIII (vestibulocochlear n.), myelencephalon, temporal lobe, occipital lobe, quadrigeminal plate, lumbar plexus, brachial plexus, periodontium.
They have four different detox formulas but I think this is the one that closest matches up with your symptoms.
Also, I like CajunGrl's suggestion about taking Magnesium Citrate. I take that and it does have a calming effect on me.
Sorry for all the suffering you're going through. Praying for you!