Should I be concerned. I have 2 hypoechoic solid exophytic nodules with increased blood flow 1.5-1 CM &isthmus is 8 mm &small submandibular lymph node?

Need followup. Sounds like you need additional followup. If these are thyroid nodules then the next thing to know would be if they are functional (producing thyroid hormone) or not, that is usually done with a nuclear medicine scan. Also, a biopsy may be necessary. I wouldn't lose sleep over it, but certainly don't ignore it. Call the doctor who ordered this test and follow up.