Hi! Me And My Husband Are Having The Same Experience.

Hi! Me and my husband are having the same experience. We ate fish 2 nights ago. We dont usually eat breakfast and lunch because of work. We decided to eat at a local restaurant (everything was grilled) we ate a grilled marlin. Is that the reason why we have this oily substance? we havent eaten anything aside from that. Just eggs and biscuits. Please help :(