Hello My Dear, First, congratulations on the baby! The pain in your left ear that you are having can be from several things. One thing that comes to mind is gritting your teeth at night from worry, stress. It can also be caused by irritated sinuses. Has a dentist ever suggested a bite-guard for you? And then, lastly, you may have a cavity in a tooth on that side of your mouth. Unless you know the cause, it is difficult to suggest a treatment. If you need to gain healthy body weight, make certain you are getting a balanced diet and use full fat milk products, eat more nuts and seeds, use salad dressings liberally, eat small frequent meals high in calories, add oils to your recipes (virgin olive oil, flaxseed oil), eat cheeses; all these are high calories with healthy fats for the baby. No junk food and no sugar. Keep taking your multivitamin as directed and walk unless dr. says otherwise. Regards, Kathryn Shattler, MS,RDN