Hi there,
Many pathological conditions could be the possible causes of your
symptoms like migraine attacks, thyroid disorders,spondyloarthropathies, peripheral neuropathies etc.Generalized anxiety disorder can cause nausea,headache,sweating,flushing,numbness irritability, decreased concentration etc.The other closest differential is fibromyalgia and post traumatic stress disorder .Fibromyalgia is diagnosed by a complete history and physical examination.