About two weeks ago, after several weeks of extreme hot tempatures (115+) and then several days of rain, the leaves on my mexican life tree started to curl & wilt. I started watering it more thinking is was lacking water, but it has gotten progressively worse. I am afraid I'm going to lose the tree. Prior to this problem it was very healthy and producing lots of fruit.

Any help would be appreciated. Thank you!

The pictures are so small they are really hard to see. I suspect overwatering. Overwatering shows symptoms of being dry because the roots are soaked and can no longer take up water.I would stop watering for a while as citrus like to be somewhat dry before each watering. IF the soil does not drain off water after a rain you MAY have to relocate your tree. Citrus really hate wet feet and express their displeasure by dying.