hi i had gone through your query and understand your concerns. i would come up with two possibilities
1.the first one include;PELVIC INFLAMMATORY DISEASE-CERVICITIS
may be the cause for your sufferings of lower abdominal pain
scanning for pelvis,and P/V examination may confirm the diagnosis.
2.second possibility for catching cold is,ALLERGY;
possible causes include;
-inherited influences; family history of allergy,asthma,sinusitis
may confirm the diagnosis.
I hope this is helpful for you, thank you