I stopped taking antidepressants in July and I've experience almost or actually exact symptoms as yours ever since mid August.
I've had the following
1.Headaches that shift from right to left, back to front or top,
2.Slight burning sensation on various spots on my head
3.Ear aches
4.Vertigo/feel off balance when other people tell me, nah that's your mind since you're not falling or walking like a drunk
5.Had weird visual disturbances likes my eyes are trying to refocus, or light stuff.
6. Nausea - though that resolved itself in Mid September.
Then, those symptoms stop and shift to panic attacks symptoms were I feel my throat closing or I need to run away or shifts to abdominal cramps. Then, I had hives crop up on my obliques or right forearm. And as far as I know brain tumors don't cause abdominal cramps or in my case, hives/rashes lol!
Thank my lucky stars I haven't had seizures or vomited. In addition, the headaches don't wake me up from my sleep. It's after I wake up, when begin to feel slight sensations in my head.
I told my primary I feared that I had some blood cancer or a tumor. She prodded my neck and head to see if I had inflamed lymph nodes that could indicate something was wrong. Nothing. Checked my ears, nothing. Did blood work, nothing. Hives...Was just a Heat Rash.
Kinda wanted to do CT or MRI, though she chalked this to anxiety. Though, being a worry wort, I don't believe her. She wants to put me back in meds. I'm like no. I'm done.
The moral of this story Anxiety can create some of the most scariest symptoms especially coming off antidepressants.