Nginx is not working with multiple domain when we trying to proxy pass each domain to ELB it only pass the content of 1 domain for both sites - apache

Question

#### Nginx is not working with multiple domain when we trying to proxy pass each domain to internal load balancer ################################################################
worker_processes auto;
events{
worker_connections 1024;
}
http{
include mime.types;
default_type application/octet-stream;
log_format main '$proxy_add_x_forwarded_for - $remote_user [$time_local] - [$request_time] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent"';
access_log /var/log/nginx/nginx.access.log main;
error_log /var/log/nginx/nginx.error.log error;
sendfile on;
tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
gzip on;
include /usr/local/nginx/conf.d/*.conf;
server{
listen 80;
server_name xxxx.com;
access_log /var/log/nginx/xxxxxx.com.access.log main;
error_log /var/log/nginx/xxxxx.com.error.log error;
index index.php index.html;
location / {
proxy_pass http://internal-ELB.ap-southeast-1.elb.amazonaws.com:80;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
server{
listen 80;
server_name yyyyy.com;
access_log /var/log/nginx/yyyy.com.access.log main;
error_log /var/log/nginx/yyyy.com.error.log error;
index index.php index.html;
location / {
proxy_pass http://internal-BT-internal.ap-southeast-1.elb.amazonaws.com:80;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
}
}