B737-800
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 180
Situational Awareness; Human-Machine Interface
Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Flight Crew Exited Penetrated Airspace; Flight Crew Regained Aircraft Control
Weather
We took off from BNA on Runway 20 left in a heavy -800. Right after takeoff; we encountered light to moderate turbulence and moderate rain.  At 1;000 feet I asked for flaps 1 and then flaps up as the aircraft was accelerating quickly through 195. Within seconds; the airspeed began to decrease rapidly and we were quickly in a 1;200 fpm descent. I reduced the angle of attack to approximately 10 to 12 degrees and added full thrust. At about the same time; we got the stick shaker for about a second. I put two hands on the yoke to get control of the aircraft and my First Officer put his hands on the thrust levers. I reduced the angle of attack; the aircraft begin to accelerate quickly; and we continued our climb.Possible Preventative Measures: We used the autothrottles on takeoff and at 1;000 feet the throttles began to come back as we were cleaning up the aircraft. In the future; if I encounter the same weather conditions; I will not use the autothrottles for takeoff.
[No additional information was contained in the secondary narrative].
A B737-800 flight crew described a low altitude encounter with severe windshear including rapid acceleration; deceleration and loss of altitude.