OP, I disagree with Idrather. It DOES sound like possible peri menopause - though obviously rule out other things first.
Aged 39/40, I ended up having brain scans, MRIs, and all sorts of other unnecessary tests as my former GP didnt realise that menopause/peri menopause can cause more symptoms than the usual anxiety, vaginal atrophy, hot flushes, night sweats etc.
Luckily I found a super endocrinologist who immediately suspected the peri menopause to be the cause of my random tingling, numbness, nausea, back ache, dizziness, palpitations and brain fog/feeling like I wasnt in a room when I was. Blood tests showed my FSH (usual indicator of menopause) was normal but my estrogen was all over the place. It's often these estrogen fluctuations that cause these weird symptoms in peri menopause. (Remember that estrogen affects 250 processes and parts of the female body, so it's no surprise that symptoms can be varied. For example, estogen can affect water retention which is what was the cause of my numbness and tingling).
Please look at this OP www.34-menopause-symptoms.com/perimenopause.htm and you will probably find the website menopausematters helpful too.
My current GP, a female in her 40s with an interest in women's issues has been amazing and things are now massively better for me.