Greend, I don't know if you read before on this site when people have mentioned the fact that you actually don't need to "feel anxious" for the body to exhibit the signs of stress and/or anxiety. As sixpack used to love to say, anxiety by and large plays out on a SUBCONSCIOUS level. You need have to actually be experiencing fear or nervousness or excitement to by symptomatic.
What you're experiencing sounds an awful lot like the byproduct of subconscious anxiety. I get that weird, squishy, nervous feeling in my chest and stomach nearly daily. Sometimes, like right now, I associate it with my body trying to get me out of bed, as stress hormones are generally higher in the morning. But when I feel it other times, I realize it's something nagging at me—like I need to go get that work done, or I need to make that phone call I don't want to make, or I need to deal with that issues—I can choose to heed whatever it is or not, but the one thing I don't do is interpret that icky feeling as a sign that something is physically wrong with me.
The fact that you react to these bodily sensations with fear and worry, and then with your worry you go and get a bunch of tests—you don't NEED to "feel" anxious—you are driving up your own anxiety through this very cycle. The key to feeling less worried and less symptomatic is to break that cycle. That means trying not to react fearfully or assume the worse when these sensations happen. That means not googling (if you do) and it means not going to the doctor to get another test. This isn't easy at first, because it will feel like the exact opposite of what you should or would want to do. But trust me, if you can push past that point, you will start to feel better.