How long ago did you start taking your meds and how much are you taking?
Constipation and indigestion are both hypo symptoms and what can happen when you first start taking Levo is that you thyroid will have a bit of a breather as it is tired and has been struggling for a long time. This means that whatever T4 (which is the equivalent to Levo) it was able to make will be reduced and the amount of medication you are on at the start may not be enough to compensate for this - hence more hypo symptoms until your GP increases your dose to a more acceptable level.
Hope this gives you a possible explanation for these "new" symptoms.
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