Google it.
Long story short, Telogen Effuviam is a sudden forcing of hairs into the Telogen (death) phase. It can be caused by stress, hormonal changes, and large doses of compounds ranging from Vitamin A to chemo drugs. Basically, anything that can cause a dramatic shift in your body's chemistry can cause a Telogen Effluviam (for example, it's quite common for women to experience it right after childbirth when their hormones suddenly revert back to their pre-pregnant levels).
TE is different from MPB. In MPG, an androgen (typically but not always DHT) binds to the follacle which then signals the immune system to attack it. The follacle becomes damaged, the hair that is there can no longer be supported, so it is shed. A new hair grows, but it's finer and weaker than the one before. This process can occur multiple times for the same follacle until the hair becomes "peach fuzz" and ultimately stops growing all together (the process is referred to as miniaturization).
Here's the bad news... TE and MPB are NOT mutually exclusive. As a matter of fact, a wave of MPB is often kicked-off by a sudden TE.
Bottom line, if it's pure TE, you'll get 100% of those hairs back. If it's MPB being accelerated, you won't. In practice, it's probably a little of both.
Go to
www.wholesalehairproducts.com and get their email address. Ask about their 2% spirolactone solution (not available on their site, but they have it -- trust me). Put that on your head 2x a day. It's the friendliest and easiest to apply stuff I've found yet. Some spiro creams/lotions are just NASTY!