Do not use the pea method... It is not digestive, therefore it "pushes" out the waste blockage, but in turn sometimes it can turn dangerous and become the blockage itself. Instead, try frozen or live daphnia - a natural laxative. O use 100% Epsom salt, fragrance free 1-3 teaspoons per gallon.
For the epsom salt, preferably try to quarantine him as it will make it easier on you to monitor him - and dose properly. You could even float him in the main tank for now. PRE dissolve epsom salt, and add in. You'll want to gradually increase the amount of epsom used.... A daily water change is needed, then re-add what you took out. Once you see he no longer has swim bladder continue the doses until 3-5 days after
to avoid relapse. For example: He shows improvement in the first three days, continue for a full week.
Are the brine shrimp and blood worms freeze dried? I avoid feeding freeze dried because it is one of the top causes of SBD, right next to low quality flakes and over-feeding. If you can, stick to frozen foods :p Easy to find in any store that sells reptiles or fish... Plus a lot better for them than freeze dried. Freeze dried is more of a treat (which I replaced this treat with live foods).