Why does something always go wrong?

Yesterday, i was doing my opener ride for Betasso. I warmed up sufficiently, was hydrated, feeling fine. I went hard up the first climb and my max HR was really low compared to normal and suddenly everything got really bright. I had to get off my bike and was doubled over with nausea. Then I felt like I was going to faint and couldn't stand up anymore, so I had to sit on the side of the trail. I tried to keep going, but felt the same way. I turned around and went home.

Saturday morning. heading up to nathrop in a couple minutes. I hope I can race. If I feel like I'm going to faint again, that could be bad news. I'm nauseous this morning too. I hope it's not the concussion coming back. I haven't hit my head since it happened over a month ago. Send good vibes my way, I'll need it probably just to finish. :( On another whiny note, coming DOWN Betasso, my wrists are back to the pain again. GRRRR. I just want to ride my bike and feel good. Why is it so hard?