Its definitely pinworn, and yeah, dont worry, its easily curable !! The history you are describing is classical for pinworm .It is always associated with intense itching.
You shud take anti-parasitic medications for it from nearby doctor, and at regular interval, as its eggs are very small and sticks to undergarments, and when you use your hands for itching, it causes reinfections.
You should also keep yourself clean, as it mostly flourishes in untidy people.
There is also association of anaemia
with it, you should take iron suppliments for that .
Dr Hari Om Chandrakar