Not all fish oils have too much vit A, cod liver oil is known for that. Vit E is used to stablize many fish oils so you should check yours first, especially tubes and pumps.
The dosage for vit E is
<25lbs 50-100IU/day
25-50lbs 100-200IU/day
50-75lbs 200-300IU/day
75-100lbs 300-400IU/day
>100lbs 400IU/day
Older fish oils will have used up the Vit E used to stabilize it, so that’s why using capsules is usually recommended, but either way always make sure your fish oil is fresh.
The other thing to keep in mind is that there are actually 8 different vit Es, most supplements only have the 4 tocopherols. NOW Foods has a Gamma E complex that actually has all 8 Es in it.
