Take a glass of water, hold your head back, take two fingers and place them on each side, below the adams apple just above
the collar bone
, and take drink of water, if the lump
you noticed goes up and down when you swallow, it is your thyroid. or it could a nodule on your thyroid, the other symptoms you are having fit thyroid also, its not anything to get stressed out about, but you shold have a thyroid blood test done, including an ultrasound.