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Mumsnet hasn't checked the qualifications of anyone posting here. If you have medical concerns, please seek medical attention; if you think your problem could be acute, do so immediately. Even qualified doctors can't diagnose over the internet, so do bear that in mind when seeking or giving advice.
You shouldn't have any side effects as you are just replacing a hormone you are deficient in. (I am on thyroxine).
The symptoms you describe are symptoms of thyroid disorder itself. It can take a few months for the thyroxine to balance your levels. Leave it a while longer then request another blood test to check you are on the correct dose if your symptoms do not improve.