With such presentations in my clinic, I would suggest IgG replacement therapy,it is the treatment of choice for most primary immunodeficiency syndromes. For dizziness you can use Betahistine 1 tablet twice a day for 1 week. For tiredness you can give multivitamins-Zincovit or Revital for man 1 tablet once a day for 1 month. For constipation try to follow the following guidelines. - High fibre diet, green leafy vegetables-beet,zucchini, fruit,fresh juices. - Cut down the processed food. White bread, doughnuts, noodles, pizza,rice should be completely avoided. -A 40 minute physical activity every day like morning walk, evening walk or a visit to the gym or swimming pool. -Dufalac 1 tablespoon once a day for 1 month. Start on these changes and get back to me in 2 to 3 months. Wish you good health.