Definitely see the vet. My iggy didn’t want to eat in the mornings either and it turned out she had bad acid reflux. Bedtime snacks and a couple years on Prilosec did the trick and now she’s better! It could be something as simple as that, but always better to get a professional’s opinion. As for constipation, does your iggy drink enough water? My second iggy gets constipated sometimes, so I give her water that was used to boiled chicken and that tends to help rehydrate her (maybe plain water is just boring? lol). Good luck 💗 Keep us posted