I am taking slimming pills and omega 3. Any side effect?

Yes. Krill oil and fish oil are the new snake oil, both are high in omega 3 fatty acids which are extremely fragile. Omega 3 fish oils reduce triglycerides by impairing the liver's ablility to make them. However the oxidative stress caused by fish oil actually raises LDL cholesterol. Some day we may use the phrase "this is just more fish /krill oil" or "here comes the fish/krill oil salesman".
Omega 3 = snake oil. Omega 3 fish oil is the same as snake oil, both are high in omega 3 fatty acids which are extremely fragile. Omega 3 fish/snake oils reduce triglycerides by impairing your liver's ablility to make them. However the oxidative stress caused by fish/snake oil actually raises your LDL cholesterol. Some day we may use the phrase "this is just more fish oil" or "here comes the fish oil salesman".
Maybe, maybe not. Both diet pills and omega-3 fatty acids can have some side effects in some people, depending on a person's sensitivities, the ingredients (active and inactive iingredients) in the pills, the amount of the pills, etc... One can take the actual pill containers to the doctor and ask the doctor about using the pills.