Ify asked:
May 10th, 2017 16:23:39

How do you combine work which I believe is a vocation/calling and self-realization, fulfillment of purpose and be happy at the same time?

Once you are doing the work God has assigned to you to the best of your ability - you will find fulfilment and happiness. It does not mean you will not face challenges or have times when you are down, but ultimately It is by the Grace of God that everything is possible.
I recommend reading Rick Warrens book “a purpose driven life”