you develop dizziness
and weakness when u get up .
this is called postural vertigo . or u develop hypotension
that decrease in blood pressure when u stand up .
you should consult to general physcian .
do you have any pain in ear ?
is any change in your daily routine ?
are u sleeping at time and taking proper sleep ?
taking any medication ?
get your BP examine in different position lying , sitting and standing .
get ECG done to rule out the tachycardia
and one more thyroid profile , these kind of symptom increase heart rate
seen in hypothyroidism
hope this will help u .