Synthroid and hormone levels

I am only 18 and recently diagnosed with hypothyroidism, after gaining around 12 lbs over 3 months. At first they just put me on a diet, but after some blood work, I was put on Synthroid to even out my hormone levels. I feel mostly depressed, moody, lethargic... REALLY LETHARGIC! and I haven't had my period in 3 months now! it's starting to worry me... I do have cramps, but no period!!

No one really explained me the disease, though. The nurse just gave me the medication and dismissed me. I wasn't aware of the effects of the disease, or the side-effects of the medication. After how long should I expect my period? The doctor just keeps recommending pregnancy tests. It's time for them to take some time, and pay more attention to their patients' needs and concerns!

I think what a lot of people are posting here are more side effects of thyroid conditions rather than side effects of thyroid medication. After my RAI treatment I started on a generic brand of levothyroxine. I even got my doctor to let me try Armour Thyroid since many people do well with it rather than Synthroid. Armour didn't work well for me, but it definitely is the only way to go for some people. After months of misery, things finally smoothed out. I was a royal pain in the butt to my doctor because I questioned everything. The biggest side effect for me going from hyper to hypo was edema. A clinical name for water retention. It wasn't so much the bloated feeling that bugged me. It was the pain in my hands and feet from the water retention. I have never, ever had a problem with carpal tunnel syptoms even though I have always used my hands a lot for work and I play the guitar. I had to add a small dose of dieuretic to control the edema and relieve the hand and feet pain. Sometimes it does flair up depending upon what I eat and how much I sweat, but that's what goes along with this type of illness. It's not just a magic pill that makes you feel "back to normal". You have to be demanding of your doctor to try other things to get you to feel right. You even have to pay attention to how you feel at different times of the year to figure out how to adjust what you take, eat, or do to feel better. I have noticed that with all things remaining constant, how I feel in terms of energy level and edema is related to the season. The body is weird that way. I still have side effects from the treatment from time to time, but I finally figured out what seems to work best for me. Maybe things could change over time, but I've learned that medicine just doesn't have a black and white treatment plan that works the same for everyone for thyroid related conditions. To sum it up, question everything your doctor tells you, demand to try things that you think would help you feel right, pay attention to what your body is telling you and adjust, and fire your doctor if they treat thyroid problems as black and white. Your doctor is not the one suffering from the condition, you are. It's your life and there's nothing wrong with being demanding about wanting to feel right.