If you want to use an amphetamine liek Ritalin to increase your energy, that has to be your decision. I can't say I recommend that approach.
Have you tried Maca? It is good for increasing energy levels and helping to balance hormones. Many people who take it report increased energy levels.
Have you tried Selenium? It is VITAL to the process that converts T4 to T3 in your liver. Since 80% of the T3 in your blood should come from the liver and not the thyroid gland, it makes sense to try it. Start out at 200mcg a day for a month, then drop back to 100mcg a day for maintenance after that.
My feeling is that I woudl try those two things before resorting to an amphetamine.
I am not a doctor, nor have I ever played one on TV...