My wife also suddenly came down with severe, unexplained, highly atypical psoriasis when the first short-sunlight days came after she began taking Atenolol. I have since learned (with some help from Rich) that several beta blockers have been associated with this, although you won't find warnings about it in most drug references.
However, it's not isolated to Atenolol. And it certainly doesn't happen to everyone (I take Atenolol without this issue - so do many here). Other beta blockers can cause this, as well as some ace inhibitors. Also other drugs, including lithium, Chloroquine. Indocin, or even NSAIDs or progesterone, can lead to similar problems. Alcohol consumption can be a psoriasis enabler for some of these chemicals.
The blood-brain barrier is an actual membrane that limits which chemicals can pass through the small blood vessels into the central nervous system, particularly the brain. Atenolol is blocked. Toprol (metoprolol) can pass through the membrane, so it does get to the central nervous system.
Atenolol is usually thought to have fewer side effects (including fatigue) than the other beta blockers because it doesn't reach the CNS. However, each person has his or her own chemistry, and his or her own reactions to medicines. In your own use, you might find Toprol causes the same or less fatigue than Atenolol. It's worth a try, if Atenolol isn't doing the job for you. Or you could pass Rich's Altace suggestion on to your doctor.
Best wishes,
I have taken both in the past fortunately I have been able to stop them. 
