You are not alone, Rose. I think all PhD students experienced the lack of concentration all the time. Being into the 3rd year of my PhD study, I am no exception and have to constantly fight distractions.

A few things I have done recently to stay focus are:
1. Deactivate my facebook account - it took up too much of my time
2. Block certain people whom I used to chat very often at Skype - another source of distractions
3. Started a PhD blog - to destress whenever I feel the need of venting my frustrations
4. Muching melon/sunflower seeds while reading or writing - they relieve tension and are healthy source of minerals for my brain

Hope the above sharing could be of help to you.

Hang in there, Nti97sma. What you are feeling now is very normal/common for all PhD students.

I am in the 3rd year of my PhD study and have gone through all those blues, doubts, anxieties, stress, distress, and constantly thinking of throwing in the towel, even recently. Doing PhD is a very very lonely journey, which only the toughs could go through during those tough times. However, no one can go through the journey without the help and encouragement from people close to them. They could be family members, friends, fellow PhD students, etc.

How I managed the last 2 over years was by sharing my burdens with those who understand (especially if they are doing or have completed their PhD) and reminding myself the reason for doing my PhD. To me doing PhD is a time of experiencing and learning about life and people; not about studying to get a paper qualification. So I find myself fulling the aims I set out for my PhD journey so far, and have been enjoying the journey inspite of those difficulties. It is also very important to ensure that the research topic I selected is one which I am really interested in to see me through the 3 to 4 years of study. Lastly, praying for peace, wisdom and inspiration from God is very important too.

Just some thoughts to share.

Cheers!