I lived in Scotland as a child, and LOVE thick cut rolled oats. The thicker the better. Some Scots make salty porridge, with water, that I don't like. I prefer the sweet variety with milk and honey. I could eat it raw, since I love it so much, but that has unfortunate intestinal consequences
You can cook oats with milk, it won't hurt your cholesterol that much, OP. If you're really worried, you can use fat-free milk.
Lowering cholesterol is all about not eating processed foods, that contain a lot of added fats, and avoiding red meats, and charcuterie (bacon, sausages, etc). It doesn't mean you can't have eggs or milk in moderate amounts.
Lowering blood pressure is all about eating less salt.