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Hello and welcome. I'm Dr Chip
I'm not sure what specifically is your question here--can you clarify that for me please?
A few questions first please--
Any vision problems?
Any vertigo or balance problems?
I understand your concern here, but a brain tumor would be unlikely for the following reasons--
This is intermittent--with a brain or olfactory nerve tumor, once the symptoms begin, they don't let up.
No constant severe headaches
No vision problems.
That isn't to say there isn't something going on here--possible sequelae from a sinus infection, diabetes, an autoimmune disorder--so you need to have your doctor check it out. I'm sure, though, that an MRI of your brain will be perfectly normal.
Please let me know if you need any more information.
OK. That may be from depression, but it could be a signal of early Alzheimers
A fully battery of cognitive tests from a neurologist could check for that