Can I have an autoimmune disease with perfect lab results?

I have been suffering with different pains for 5 years and I’m currently 18. It started with pains in my chest and back after I got sick for about a week. My doctor said they didn’t know what it was and that it was most likely just a weird symptom from a normal cold. A couple months later the same thing happened with less pain in my back and more in my chest. I went to the doctor again and they said that it only hurt because I had a sleepover the weekend before. Every few months I would be in extreme pain that would keep me in bed for about a week then it would go back to normal. After happening a few times my doctor finally did some blood test but my blood work came back perfectly normal so the doctor sent me home with no answer. After 3 years of mysterious flare ups of pain, the worst one happened. It started with my chest but I then got rashes all down my legs and arms, as well as redness on mostly one side of my face that was extremely hot even though I had no fever. My joints were also really hurting (it felt like really bad growing pain) mostly in my ankles and legs. This time the pain lasted for about a month and if I got out of bed to eat or do something I would end up on the floor crying in pain. This is when we finally forced the doctor to give us a referral to some more doctors. I then saw pulmonary, gastrointestinal, dermatology, physical therapist, and rheumatologist who all did tests (or looked at my previous blood work) and said I was perfectly fine. My mom and I found autoimmune disease and I saw that cutting out gluten is the first step for autoimmune disease so that’s what I did. It has now been 2 years without gluten and I feel a lot better. I no longer have weeks spent with chest pain. I do get flare ups still but they are much better. I will get the rashes and a little bit of chest pain but not the same as it was. I do feel better than before but I am still suffering with pain and fatigue without any diagnosis and the doctors telling me I’m perfectly fine. Is it possible to have an autoimmune disease with perfect lab results? Or if anyone has any suggestions on how to move forward I would very much love to hear. Thank you!