No one here can diagnose you, but I would advise you to immediately stop trying "internet remedies," including drinking baking soda with lemonade. This is likely contributing to, rather than alleviating, your problems.
Please see a doctor as soon as possible.
Hello~I suggest seeing your PCP as soon as possible, you need a professional to ascertain what is going on and that can only be accomplished by blood work, etc. You might a case of the flu, IBS, or some other gastrointestinal disorder, but don't second guess it, see your doctor soon.