Worried about my diagnosis

I'm brand new to this and hoping for some real advice rather than Google terrifying the life out of me!

In August 2014 I began feeling extremely tired, dizzy, loss of weight, loss of hair and had a lump in my neck. I went to my gp who did a series of blood tests including thyroid function tests and they all came back normal.

The lump grew bigger and my gp referred me to the thyroid clinic. After more tests (all normal levels) I persuaded them to do an ultrasound. They discovered a very large lump in my thyroid but was benign.

In Feb this year I underwent a partial thyroidectomy where they discovered my left side of my thyroid had grown under my collarbone and down into my chest.

Following surgery my symptoms persisted. I now have an enlarged right side of my thyroid. The surgeon said he noticed it was enlarged during surgery but did not want to remove it unless absolutely necessary.

I now have an even bigger lump, fatigue, headaches, dizzyNess, hair loss and really itchy skin all over (mainly at night).

I've read about lymphoma and am worried my symptoms have been misdiagnosed....

Any advice????

Thanks xx