Dreamchaser, does your pot have drainage holes? Why water so much? 2-3 times a day is way too much water.
What type of soil are you using?
Water only when soil is dry..stick your finger deep into the soil..Sometimes top soil looks dry, but midway to lower soil remains wet. If the soil is constantly wet, eventually roots aren't going to absorb water and/or fertilizers.
Lifting the pot is another way to test soil..lift plant when soil is dry..it should be light in weight..then water, and lift again..pot will be heaver.
The last resort is using a water guage. Rapitest sells guages from 15.00 and up.
Make sure your container has drainage holes. If it doesn't plus you're over-watering, your citrus will die.
I hope the soil your using is well-draining. Heavy soils stay wet much longer than fast-draining mediums.
For the time being, remove dead leaves. They will NOT return green. Clip dead branches, if any. If citrus is in a pot without drainage holes, repot in a well-draining soil, in a container with drainage holes. If possible, place you tree outdoors, staring in semi-shady area working up to brighter light.
How often do you fertilize? If often, you may need to leach soil, (run water into soil to remove excess salts) Good Luck, Toni

Sorry, Typo in my original post - I water 2 - 3 times a week NOT a day. The container does have drainage hole and I use well draining soil.

I agree, that is WAY to much water. If this is outside, once a day maximum, and then only a small amount each day. reduce your water and it should perk up.