Welcome in H.C.M.
I have gone through your query , As you said you were feeling difficulty in breathing and your eyes are popping out , you are also having headache and dizziness
Your all these symptoms are in favor of THYROTOXICOSES. which is a stage of hyper thyroidism. Since you have a small lymph
node in neck which has got important diagnostic value.
Please don't try self medication
. You are advice for these important investigations-
(1) Thyroid profile- T3, T4, TSH
(2) F.N.A.C. from Thyroid gland and Lymph node of neck.
After the reports of these investigations final diagnosis can be made than after treatment may be plan.