Just as a piece of unsolicited advice... I would still take him in for a check-up with a reputable herp vet. That isn't normal behavior, even given short-term insufficient UVB/D3, and is a big red flag for MBD. MBD (metabolic bone disease), if left untreated, is fatal. I am not intending to sound alarmist, and I realize you do not know me since I have not been around the forum much in the last couple of years, but this would definitely be one of those "better safe than sorry" situations. The other thing to be aware of is if he got into any plants he shouldn't, I have heard of shaking being a reaction to eating mildly poisonous plants, but this is FAR less common of a cause than MBD.
I wish you and your lizard friend all the best!
Elizabeth
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1.0 Mali Uro Archimedes (May he rest in peace)
0.0.1 Egyptian Uro Zuberi Mosca Khu (Mosca)
0.1 Sulcata Minnie
1.0 Iguana Flik
0.1 Iguana Loki (May she rest in peace)
Madison, Wisconsin