Minor troubles with palpitations. A little nausea, on and off fast pulses etc. Taking fish oils. Help?

Get checked. To be sure that you do not have a serious problem with your heart rhythm, i would recommend getting checked out by a healthcare practitioner.
Palpitations. To know what is going on more information is needed. Many palpitations do not need any treatment. That you have symptoms in addition to the palpitations raises questions. You should be checked out to see what's going on. I doubt fish oil would be recommended, but wouldn't speculate more with the little information here.