G6, nothing seems too out of the ordinary here. As GOP says, avoid caffeine and alcohol for sure for the first 3 months. Your tiredness may be just a result of the whole stress of PCa, having a treatment, etc. I doubt that the seeds are doing much in that regard.
Take care and keep us posted.
Age 62 (64 now), G 3 + 4 = 7, T1C, PSA 4.2, 2/16 cancerous, 27cc. Brachytherapy 12/9/08. 73 Iodine-125 seeds. Procedure went great, catheter out before I went home, only minor discomfort. Everything continues to function normally as of 12/8/10. PSA: 6 mo 1.4, 1 yr. 1.0, 2 yr. .8. My docs are "delighted"! My journey: