Please see my PM about swollen lymph nodes. Have you had any testing for inflammation markers, like ESR? Tingling can be potentially muscle spasms if it's in your head- at least that's what a neurologist told me my tingling sensations were when I told him about ones I was experiencing there. It's a shame the neurologist felt an MRI wasn't warranted given your symptoms! Any new kind of headache that is severe I believe warrants a brain scan.
You say you've been feeling dizzy- perhaps compression of spinal cord, vestibular problem (consult an ear, nose & throat specialist), or circulatory issue, where not enought oxygen is getting to your brain. Have you had your iron and ferritin tested lately as well as a CBC? How are your orthostatic blood pressures, if dizziness is worse with standing?
Welcome to the MedHelp forum!
Neck lymph nodes can be the result of tonsillitis, pharyngitis (infection of upper throat), infection in mouth, caries in tooth, internal ear infection, outer ear infection, eczema, dermatitis, dandruff, breast cancer, fungal infection, other cancers like lymphoma etc. If you had flu like symptoms initially then it could be due to infectious mononucleosis too. It is difficult to comment beyond this without examining. The enumerated the possibilities can be investigated or ruled out one by one by your physician and dentist.
The tingling in neck and dizziness can be due to the nodes. It can also be due to cervical spinal nerve compression. Chances of this are less as MRI of neck is normal.
Hope this helps. It is difficult to comment beyond this at this stage. Please let me know if there is any thing else and do keep me posted. Take care!