You are very welcome, Manal. :hug
The lines you are describing are called Splinter Hemorrhages. They can be tiny vessels that have been traumatized, or there can be an underlying heart problem. The fast heart beats can definitely (and most-likely are) related to the anemia, but I'd suggest you see a doctor anyway if you are not aware of any recent trauma to your hands/fingers/nails.
If you see your doctor, he/she will recommend what tests may reveal the problem, if there is one.