Anyone ever have an underactive thyroid?

How did the Dr check for this? Bloodwork? What did you have to take help make your thyroid more active.

Google "Hypothyroid" for the symptoms.
I've had mine removed about 8 years ago.
Bloodwork is the only way to diagnose/monitor your T3 levels.
You can find out about your thyroid function through a simple blood test called TSH. If it is low you will be given synthroid by your doctor. Having low thyroid will make you feel tired and usually people who have this are a little overweight because it slows your metabolism. The good news is the synthroid gets evertyhing back to "normal". You'll have energy etc. It's a very small pill. The bad news is you wil require bloodwork every few months or so to regulate your levels. Good luck to you!!
What were your side effects of having an under-active thyroid?
A TSH (blood work) was done to determine I was hypothyroid. My symptoms were, weight gain, difficulty losing weight, IBS with constipation, sensitivity to light, low body temp, low blood pressure, slow pulse, fatigue, headaches, ridged fingernails with no moons, dry skin, dry thinning hair, muscle and joint aches

I take medication to provide my body with the hormones my thyroid gland isn't making. I take Armour thyroid, which is a T4/T4 natural medication About 95% of my symptoms are gone. Al I have for symptoms now are the ridged fingernails with no moons and cold feet at night.