Welcome to the forum, pooherb,
Yes, your symptoms do sound like those who are experiencing a Raynaud’s attack. You mentioned that you have Hypothyroidism and we do have several members with this condition as well, so this may be your connection, although you should be seen by a rheumatologist to rule out any connective tissue disorders which could coincide.
There are medications called calcium channel blockers that one can take and they help to keep the blood vessels open, thereby preventing an attack, or, lessening the severity of one. Talk with your doctor about trying these if you haven’t already done so.
Please keep us posted on your progress.