6 Iyar 5778 -Tazria-Metzorah

The sombre commemoration of Yom Hazikaron (Israel Remembrance Day) always immediately precedes the jubilant celebration of Yom Haatzmaut (Independence Day). Why are these two days straight after each other? How are we expected or able to suddenly shift our feelings from that of sadness and reflection to those of joy and ecstasy?