try reposting in the citrus section of the forum, you may get better responses.
It looks like your tree needs fertilizer. It is quite yellow. Also, many leaves look deformed, perhaps leaf miners or some other insects were attacking the new growth before it filled out.
I do see new buds opening in your pictures. New growth is a good sign. If the new growth is consistent and becomes a nice dark green your tree should be fine.
The pictures are a bit blurry, but what is the white stuff on the 3rd picture from the top? It looks like scale... cottony cushion scale or mealybugs maybe. Look at that area more closely. If you have scale it can be detrimental to tree health